I once had a DCS460m, which had the original monochrome 6 MP sensor in it, plus I had one of the Kodak color wheel options for it. My experience with that lash-up vs. a DCS460c with the bayer CFA was that the three images with the color wheel gave about a 50% increase in color resolution over the bayer CFA single image.
What was most important was that there was no color aliasing with the mono/wheel merged images, whereas the 460c was pretty badly color aliased most of the time. I can't say that there was any really noticeable increase in luminance resolution, which makes sense as the pixels are overlaid.
I did have some issues in keeping the whole mess from moving between shots at times, even with the large format tripod I have which was originally meant to hold up an 8x10 view camera. If anything moved, then the resultant merged image was a mess and a half.
I later wound up selling both cameras and the color wheel in favor of a DCS660c with it's improved sensor and addition of a swappable AA filter.
Note that my subject matter was artwork imprinted onto textiles, as much of it still is. The 460m with color wheel was a lot of effort to put into making images of screenprinted items, for sure! It was a case of the gear showing up and my just having to give it a try, more than anything else.